Evaluation of metal loadings and bioavailability in air, water and soil along two highways of British Columbia, Canada
Evaluation of metal loadings and bioavailability in air, water and soil along two highways of British Columbia, Canada
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DOI：
10.1007/s11270-005-9063-0
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发表时间：
2006-05-01
影响因子：
2.9
通讯作者：
Li, LY
中科院分区：
文献类型：
--
作者：
Preciado, HF;Li, LY
在加拿大温哥华的两个高速公路站点进行了全面的多媒体监测现场调查，其中包括：大气、雨水径流、道路沉积物和土壤样本，重点关注铜、铁、铅、锰和锌，因为它们在当地和全球的大多数高速公路环境中普遍存在。通过对颗粒物进行连续提取以及通过与公路径流的螯合树脂交换来评估金属潜在的生物利用度。在大多数情况下，道路沉积物与径流和大气金属浓度（Fe > Zn > Mn > Cu > Pb）非常相似，这表明道路沉积物是当前金属负荷的有用指标，也是影响城市流域质量的关键因素。在所有样品中，金属的生物利用度随着粒径的减小而增加。因此，路尘和路边土壤的生物有效性较低，降尘的生物有效性中等，大气悬浮颗粒物和径流的生物有效性最高。不同环境介质中的形态分析表明，锌是未来潜在关注的金属。在大多数灰尘、空气和水样品中，锌的浓度仅次于铁，并且表现出最高的迁移率和潜在的生物利用度。
A comprehensive multi-media monitoring field investigation, which included: atmospheric, storm-water runoff, road sediment and soil samples, was carried out at two highway sites in Vancouver, Canada, focused on Cu, Fe, Pb, Mn, and Zn, due to their prevalence in most highway environments, both locally and worldwide. Metal potential bioavailability was evaluated through sequential extraction in the case of particulates and via exchange with a chelating resin for highway runoff. Road sediment showed in most cases a close resemblance with runoff and atmospheric metal concentrations (Fe > Zn > Mn > Cu > Pb), suggesting that road sediment is a useful indicator of current metal loadings and a key factor influencing the quality of urban watersheds. Metals showed increasing bioavailability with decreasing particle size in all samples. Thus, bioavailability was low in roaddust and roadside soils, intermediate in dustfall, and highest in atmospheric suspended particulates and runoff. Speciation analyses in different environmental media suggested that Zn is a metal of future potential concern. Zinc was second in concentration to Fe in most dust, air and water samples, and exhibited the highest mobility and potential bioavailability.